dev.plumbkit/plumbkit
Plumbkit
Exact utilities for agents: time zones, date math, business days, calculator, units, validation.
alive probed 2026-10-15 · HTTP 200
16tools
5.6ktokens in Claude Opus 5.5
5.8ktokens in Claude Code
2.8 %of a 200k context window
3.3ko200k_base estimate
408 msto initialize
495 msto list tools
- Endpoint
- https://plumbkit.dev/mcp (streamable-http)
- Host
- plumbkit.dev
- Protocol
- 2025-11-25
- Reports itself as
- plumbkit 1.0.0
- Capabilities
- tools
- Instructions
- 369 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-14. Counted again when the tool definitions change. Method.
- Website
- https://plumbkit.dev
- Registry
- active, updated 2026-10-14 · registry entry
- Reachable
- 2 of the last 2 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| date_add | 450 | 14 % |
| business_days | 369 | 11 % |
| date_diff | 311 | 10 % |
| convert_timezone | 265 | 8 % |
| regex_test | 237 | 7 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-15 09:58 | alive | 408 ms | 16 | 5.6k | 3.3k |
| 2026-10-14 18:27 | alive | 807 ms | 16 | 5.6k | 3.3k |
Badge and feed
[](https://mcpcost.ulehla.dev/s/dev.plumbkit/plumbkit)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.